Log downloader questions

RouterOS General
1

Hi all,
I’m starting to use log downloader to attempt to see user traffic to internet per month. I’ll write a small app to count up totals & delete useless IP pairs etc. Just a few questions:

  1. When does the router IP pairs get zero’d? Everytime LogDownl downloads?
  2. If user connects to one router (A) through router (B) to router (C) that’s a gateway to internet, do I just need to log router (C) or must (A) also be logged. (I do not want to ‘double-charge’ clients and only want to count internet traffic)
  3. What’s the difference between TrafficCounter & LogDownloader ?

Thanks